St. Joseph, IL Weather & Growing Conditions
Tonight
57°F
Light Rain
Rain before 4am, then a chance of rain showers. Cloudy, with a low around 57. South wind around 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Light Rain | 15 mph S | 87% |
| Wednesday | 64°F | Chance Rain Showers then Mostly Cloudy | 10 to 15 mph SSW | 38% |
| Wednesday Night | 46°F | Mostly Cloudy | 8 mph SW | 1% |
| Thursday | 62°F | Mostly Sunny | 7 to 14 mph WSW | 4% |
| Thursday Night | 43°F | Mostly Cloudy | 5 mph WNW | 8% |
| Friday | 56°F | Slight Chance Light Rain then Partly Sunny | 3 to 9 mph NNW | 16% |
| Friday Night | 36°F | Mostly Cloudy | 3 to 7 mph NNW | 7% |
| Saturday | 54°F | Mostly Sunny | 3 mph NW | 3% |
| Saturday Night | 33°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 60°F | Mostly Sunny | 2 to 8 mph W | 11% |
| Sunday Night | 34°F | Mostly Clear | 5 mph WNW | 8% |
| Monday | 63°F | Sunny | 2 to 9 mph WSW | 4% |
| Monday Night | 39°F | Mostly Clear | 6 mph WSW | 2% |
| Tuesday | 66°F | Sunny | 6 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Joseph, IL
Last spring frost
Apr 20
First fall frost
Oct 21
Growing season
182 days
Hardiness zone
6a
Explore more for St. Joseph, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Ogden, Il (4.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.